\Tor`ri*cel"li*an\, a.
Of or pertaining to Torricelli, an Italian philosopher and
mathematician, who, in 1643, discovered that the rise of a
liquid in a tube, as in the barometer, is due to atmospheric
pressure. See {Barometer}.
{Torricellian tube}, a glass tube thirty or more inches in
   length, open at the lower end and hermetically sealed at
   the upper, such as is used in the barometer.
{Torricellian vacuum} (Physics), a vacuum produced by filling
   with a fluid, as mercury, a tube hermetically closed at
   one end, and, after immersing the other end in a vessel of
   the same fluid, allowing the inclosed fluid to descend
   till it is counterbalanced by the pressure of the
   atmosphere, as in the barometer. --Hutton.